I agree.. she does go overboard sometimes. Like the way she talked to Ishaan and then her own dad was too cold. And exactly as you said, being heartbroken herself, how can she so easily hurt people around her.
I honestly don't appreciate her behavior towards the family too, the expressions she gives and how she always stays aloof. It's insulting in a way - but the family is so adorable, they don't find faults in anything!!
I hope she gets over the 'middle-class family' shock and gets her act together soon!
Btw, the show is awesome and will be even more fun to watch once Suhana starts to open up with the family and Ishaan.